WO2006049006A1 - Information processing device, access device, recording medium, information processing method, and information processing program - Google Patents

Abstract

An information processing device (225) is a device for processing predetermined information recorded in a recording medium (100), and includes characteristic discrimination means (204) and processing means (226). The characteristic discrimination means (204) discriminates the reflection characteristics of the recording medium (100). In accordance with the reflection characteristics discriminated, the processing means (226) processes the predetermined information recorded in the recording medium (100). The reflection characteristics are either first characteristics, in which the reflectivity (as will be called the first reflectivity) of a beam reflected on the recorded area of the recording medium (100) is higher than the reflectivity (as will be called the second reflectivity) of the beam reflected in the unrecorded area of the recording medium (100), or second characteristics, in which the first reflectivity is lower than the second reflectivity.

Description

 Specification

 Information processing apparatus, access apparatus, recording medium, information processing method, and information processing program

 Technical field

 [0001] The present invention relates to an information processing device for determining and processing characteristic information of a recording medium, an access device including the information processing device, a recording medium accessed by the access device, an information processing method thereof, and It relates to an information processing program.

 Background art

 In recent years, large volumes of information have been communicated. As a result, development of large-capacity optical discs is underway. Optical disks include, for example, CD (Compact Disc), LD (Laser Disc), and DVD (Digital Versatile Disc).

 In optical discs, a reflective film with a metal thin film (eg, aluminum) force is formed on a transparent substrate on which concave / convex patterns (eg, pits, groups) indicating information are formed, and information is reproduced by detecting the light reflection level. Is done.

 A characteristic pattern having a different reflectance is formed on the recording optical disk by the phase change of the recording film. Since the optical disk apparatus only needs to read the change in the reflectance of the amorphous crystalline material, the structure of the optical system of the optical disk apparatus can be simplified.

 The optical disc apparatus reproduces information recorded based on the phase change by detecting the reflection levels of the plurality of recording units and the plurality of unrecorded units. Therefore, in the optical disc, the reflectance of the light reflected by the plurality of recording portions is larger than the reflectance of the light reflected by the plurality of unrecorded portions. There may be an optical disc having a light reflectance that is smaller than the light reflectance reflected by a plurality of unrecorded portions (HtoL characteristics).

Figure 7 shows the relationship between the multiple recording marks formed on the optical disc and the reflection level of the light reflected by the optical disc. FIG. 7A shows the relationship between a plurality of recording marks formed on an optical disc having HtoL characteristics and the reflection level of light reflected by the optical disc having HtoL characteristics. Fig. 7B shows the relationship between multiple recording marks formed on an optical disc with LtoH characteristics and LtoH. The relationship with the reflection level of the light reflected with the optical disk which has H characteristic is shown.

 An optical part having an HtoL characteristic (HtoL type optical disk) has an amorphous part (recording part: for example, a recording mark) having a light reflectance of about 1%. The crystal part (unrecorded part: space, for example) of the HtoL type optical disc has a light reflectance of 15 to 25% (see FIG. 7A). An optical part having an LtoH characteristic (LtoH type optical disk) has an amorphous part (recording part: for example, a recording mark) having a light reflectance of 20 to 30%. The crystal part (unrecorded part: space, for example) of the LtoH type optical disc has a light reflectance of 3 to 10% (see FIG. 7B).

 In the HtoL type optical disk, since the reflectance of the unrecorded portion is large, tracking is easy to track, but since the average reflectance of light is large, the noise is larger than that of the LtoH type optical disk.

 The LtoH type optical disc has a low average reflectance of light, so the noise is smaller than that of the HtoL type optical disc. However, since the reflectance of the unrecorded part is small, focusing is difficult to track.

 Patent Document 1 describes a HtoL type optical disk and an LtoH type optical disk. Patent Document 1: Japanese Patent Laid-Open No. 2003-323744

Disclosure of the invention

Problems to be solved by the invention

 However, the optical disk device cannot determine whether the optical disk inserted in the optical disk device is a force LtoH optical disk that is an HtoL optical disk! When an optical disc is inserted, or when an HtoL type optical disc is inserted into an optical disc device compatible with an LtoH type optical disc, the following problems (1) to (4) arise.

(1) Since the polarity of the reflected light reflected by the recording mark and the polarity of the reflected light reflected by the space are opposite between the HtoL type optical disc and the LtoH type optical disc, edge detection is performed between the HtoL type optical disc and the LtoH type optical disc. The polarity (positive / negative) of the detected value in the asymmetry detection or | 8 value detection is reversed. (2) The defective portion of the optical disk (for example, the light hardly reflects due to dust or dirt adhering to the optical disk!) Cannot be properly detected.

 (3) The modulation degree measurement method for the HtoL type optical disc cannot measure the modulation degree appropriately for the LtoH type optical disc.

 (4) When an LtoH type optical disc is inserted into a device that supports HtoL type optical discs, the upper limit of the LSI's dynamic range may be exceeded. This is because the light reflection level on the LtoH type optical disc is higher than the light reflection level on the HtoL type optical disc.

 The present invention has been made in view of the above problems, and appropriately records information recorded on a recording medium regardless of the reflection characteristics of the recording medium (whether it is HtoL type or LtoH type). It is an object of the present invention to provide an information processing apparatus capable of processing, an access apparatus including the information processing apparatus, a recording medium accessed by the access apparatus, an information processing method, and an information processing program To do.

Means for solving the problem

 An information processing apparatus according to the present invention is an information processing apparatus that processes predetermined information recorded on a recording medium, and includes a characteristic determination unit and a processing unit. The characteristic discriminating unit discriminates the reflection characteristic of the recording medium. The processing means processes the predetermined information according to the determined reflection characteristic. Here, the reflection characteristic means that the reflectance of light reflected in the recorded area of the recording medium (hereinafter referred to as the first reflectance) is the reflectance of light reflected in the unrecorded area of the recording medium (hereinafter referred to as the second reflectance). The first characteristic and the first reflectance are smaller than the second reflectance, and one of the second characteristics.

 The information processing apparatus determines the reflection characteristics of the recording medium and processes predetermined information recorded on the recording medium according to the reflection characteristics. For this reason, it is possible to appropriately process the information recorded on the recording medium regardless of the reflection characteristics of the recording medium.

 Note that the predetermined information described above and below includes, for example, user information such as audio, video, and other data, and writable information for temporarily recording specific information and performing recording learning.

The characteristic discriminating means includes at least one of the first characteristic and the second characteristic recorded on the recording medium. In either case, the reflection characteristics may be determined based on the characteristic information that indicates one of them.

 Further, the recording medium has a plurality of recording layers, and characteristic information corresponding to the reflection characteristics of the plurality of recording layers may be recorded.

 Alternatively, the characteristic determining unit may determine the reflection characteristic based on the reflection level of light reflected by the recording medium.

 The processing means may include polarity inversion means for inverting the polarity of the predetermined information according to the determined reflection characteristic.

 The processing means may include a modulation degree calculation means for calculating a modulation degree of the predetermined information according to the determined reflection characteristic.

 The processing means changes a threshold value for detecting a defective portion of the recording medium, which is a threshold for the reflection level, based on the determined reflection characteristics and the reflection level of the light reflected from the recording medium. It may include a value change means.

 Furthermore, the information processing apparatus may include a reflection level detection unit and a defective portion detection unit. The reflection level detection means detects the reflection level. The defective portion detecting means detects a defective portion of the recording medium based on the threshold value changed by the threshold value changing means and the reflection level detected by the reflection level detecting means.

 The processing means may include a reflection level adjusting means for adjusting the reflection level of the irradiated light according to the determined reflection characteristic.

 An access device according to the present invention includes a reading unit that reads predetermined information recorded on a recording medium, and the information processing device that processes the read predetermined information. This achieves the above objective.

 The recording medium of the present invention has a recording area, and the recording area is an area for recording characteristic information indicating the characteristics of the recording medium. The characteristic information includes the first characteristic in which the reflectance of light reflected by the recorded area of the recording medium (first reflectance) is larger than the reflectance of light reflected by the unrecorded area of the recording medium (second reflectance). And information indicating at least one of the second characteristics in which the first reflectance is smaller than the second reflectance.

The recording medium has an area for recording characteristic information. For this reason, for example, characteristic information is provided to a device for processing information recorded on a recording medium, Processing according to information can be performed. That is, information recorded on the recording medium can be appropriately processed regardless of the reflection characteristics indicated by the characteristic information of the recording medium.

 The recording medium may include a plurality of recording layers, and the recording area may record characteristic information corresponding to each of the plurality of recording layers.

 An information processing method of the present invention is an information processing method for processing predetermined information recorded on a recording medium, and includes a characteristic determination step and a processing step. In the characteristic determination step, the reflection characteristic of the recording medium is determined. The processing step processes predetermined information according to the determined reflection characteristic. Here, the reflection characteristic means that the reflectance of light reflected by the recorded area of the recording medium (first reflectance) is larger than the reflectance of light reflected by the unrecorded area of the recording medium (second reflectance). One of the first characteristic and the second characteristic in which the first reflectance is smaller than the second reflectance. As a result, the above object is achieved.

 An information processing program of the present invention is an information processing program for causing an information processing apparatus that processes predetermined information recorded on a recording medium to perform information processing, and includes a characteristic determination step and a processing step. In the characteristic determination step, the reflection characteristic of the recording medium is determined. The processing step processes the predetermined information according to the determined reflection characteristic. Here, the reflection characteristic means that the reflectance of light reflected by the recorded area of the recording medium (first reflectance) is larger than the reflectance of light reflected by the unrecorded area of the recording medium (second reflectance). ! /, One of the first characteristics and the second characteristic where the first reflectivity is less than the second reflectivity. This achieves the above objectives.

The invention's effect

 According to the information processing apparatus of the present invention, it is provided with characteristic determining means for determining the reflection characteristic of the recording medium, and processing means for processing predetermined information recorded on the recording medium in accordance with the determined reflection characteristic. As a result, the predetermined information recorded on the recording medium can be appropriately processed regardless of the reflection characteristics of the recording medium.

Similarly, according to the access device, information processing method, and information processing program of the present invention, it is possible to determine the reflection characteristics of the recording medium of the present invention and process predetermined information according to the reflection characteristics. Information recorded on the recording medium can be appropriately processed. Further, according to the recording medium of the present invention, the characteristic information indicating at least one of the first characteristic and the second characteristic is recorded, and the first characteristic is the light reflected from the recorded area of the recording medium. The reflectivity (first reflectivity) is larger than the reflectivity (second reflectivity) of light reflected by the unrecorded area of the recording medium. The second property is that the first reflectivity is the second reflectivity. It is a smaller characteristic. Therefore, it can be determined whether the characteristic of the recording medium has the first characteristic or the second characteristic based on the characteristic information recorded on the recording medium. As a result, the information recorded on the recording medium can be processed according to the characteristics of the recording medium.

 Brief Description of Drawings

FIG. 1 shows a structure of a recording medium 100 according to an embodiment of the present invention.

 FIG. 2 shows a configuration of an access device 200 according to the embodiment of the present invention.

 [FIG. 3A] The relationship between the irradiation level of the light irradiated on the optical disk having the second characteristic (HtoL characteristic) and the reflection level of the light reflected by the same optical disk is shown.

 FIG. 3B shows the relationship between the irradiation level of the light irradiated on the optical disk having the first characteristic (LtoH characteristic) and the reflection level of the light reflected by the same optical disk.

 FIG. 4A shows the relationship between the track direction and the playback amplitude when the recorded and unrecorded parts of the optical disk are played back.

 FIG. 4B shows the relationship between the recording power of the optical disc and the modulation factor.

 [FIG. 5] The detected light reflection level, threshold value, ground level, and detection signal are shown.

 FIG. 6 shows an access processing procedure according to the embodiment of the present invention.

 FIG. 7A shows a relationship between a plurality of recording marks formed on an optical disc having the second characteristic (HtoL characteristic) and a reflection level of light reflected by the optical disc.

 FIG. 7B shows the relationship between a plurality of recording marks formed on the optical disc having the first characteristic (LtoH characteristic) and the reflection level of light reflected from the optical disc.

 Explanation of symbols

[0007] 100 recording media

 101 Lead—in area

 102 Data area

103 Lead—out area 104 PIC area

 105 OPC area

 106 Drive area

 107 DMA area

 200 Access device

 202 Optical head

 204 Characteristic determination means

 206 Signal polarity inversion means

 208 Signal processing means

 210 Edge shift detection means

 212 Asymmetry detection means

 214 Value detection means

 216 Modulation degree calculation means

 217 Threshold value change means

 218 Defect detection means

 219 Optical disk controller

 220 Reflection level adjustment means

BEST MODE FOR CARRYING OUT THE INVENTION

 Embodiments of the present invention will be described below with reference to the drawings.

 First, a recording medium of the present invention will be described (see “1. Recording medium”), and then an access device that accesses the recording medium will be described (see “2. Access device”). Finally, the access processing procedure executed by the access device will be described (see “3. Access Method”).

 1.Recording media

 FIG. 1 shows the structure of a recording medium 100 according to an embodiment of the present invention. The recording medium 100 includes a recording layer. Information is recorded on the recording medium 100 by forming recording marks on the recording layer.

The recording medium 100 includes a lead-in area 101, a data area 102, and a lead-out area 103. In the data area 102, user information is recorded. The user information is, for example, audio information and video information, and other data.

 In the lead-in area 101 and the lead-out area 103, management information of the recording medium 100 and data for defect management are recorded.

 The Lead—in area 101 includes a PIC (Permanent Information and Control Data) area 104, an OPC (Optimum Power Calibration) area 105, a Drive area 106, and a DMA area 107.

 In the PIC area 104, for example, the maximum address of the data area 102 and the recording pulse control parameter are recorded. The recording pulse control parameter is, for example, a parameter relating to laser power for forming / erasing a plurality of recording marks on the recording medium 100 and a parameter relating to a recording pulse width for recording a plurality of recording marks.

 In the PIC area 104, characteristic information is further recorded. The characteristic information indicates one of the LtoH characteristic and the HtoL characteristic that are reflection characteristics of the recording medium 100.

 The HtoL characteristic is such that the reflectance of light reflected by a plurality of recording parts (for example, a plurality of recording marks) is smaller than the reflectance of light reflected by a plurality of unrecorded parts (for example, a plurality of spaces)! It is a characteristic. The LtoH characteristic is a reflection characteristic in which the reflectance of light reflected by a plurality of recording parts (for example, a plurality of recording marks) is larger than the reflectance of light reflected by a plurality of unrecorded parts (for example, a plurality of spaces). is there. When the recording medium 100 has the HtoL characteristic, the value “0” is recorded as the characteristic information. When the recording medium 100 has the LtoH characteristic, the value “1” is recorded on the recording medium 100 as the characteristic information.

 Note that information indicating that the recording medium 100 has the LtoH characteristic is indicated by the value '1', and information indicating that the recording medium 100 has the HtoL characteristic is indicated by the value '0'. It is not limited. As long as a predetermined apparatus can discriminate the reflection characteristic (the LtoH characteristic or the HtoL characteristic of the recording medium 100), the value shown is arbitrary.

 For example, as long as a given device can determine the reflection characteristic of the recording medium 100 (a force having an LtoH characteristic or an HtoL characteristic), it is determined by at least one of at least one recording mark and at least one space. Indicated.

Note that the characteristic information is at least one recording mark and at least one space. It is not limited to the form indicated by at least one of As long as a given device can determine the reflection characteristic of the recording medium 100 (whether it has an LtoH characteristic or an HtoL characteristic) based on the characteristic information, the characteristic information may be recorded by waviness of the track. . Furthermore, although the track is formed concentrically on the recording medium 100, the shape of the track formed may be spiral as long as the characteristic information can be recorded on the recording medium 100. Furthermore, the recording medium 100 is not limited to a rewritable type or a write-once type. As long as the characteristic information can be recorded, a read-only recording medium may be used. The recording medium 100 is, for example, a CD, a BD-RE (Blu-ray Disc Rewritable Format), a DVD—RAM (Digital Versatile Disc Random Access Memory), or a DVD—RW (Digital Versatile Disc Rewritable).

 Furthermore, the recording medium 100 is not limited to a single recording layer. There may be a plurality of recording layers of the recording medium 100. For example, when the recording medium 100 includes a first recording layer and a second recording layer, characteristic information may be recorded on one of the first recording layer and the second recording layer. In this case, the characteristic information may indicate that the first recording layer and the second recording layer have HtoL characteristics (or LtoH characteristics). Further, when the recording medium 100 includes the first recording layer and the second recording layer, the first characteristic information may be recorded on the first recording layer, and the second characteristic information may be recorded on the second recording layer. possible. In this case, the first characteristic information indicates that the first recording layer has an HtoL characteristic (or LtoH characteristic), and the second characteristic information indicates that the second recording layer has an HtoL characteristic (or LtoH characteristic). It can be shown that it has. The first recording layer and the second recording layer are not limited to having the same characteristics. The first recording layer and the second recording layer may have different characteristics. For example, the first characteristic information recorded on the first recording layer indicates that the first recording layer has the HtoL characteristic (or LtoH characteristic), and the second characteristic information recorded on the second recording layer is the second recording information. It can be shown that the layer has LtoH characteristics (or HtoL characteristics).

In addition, any of the plurality of layers may record the characteristic information of the other layers. For example, the first recording layer may store first characteristic information indicating the reflection characteristics of the first recording layer and second characteristic information indicating the reflection characteristics of the second recording layer. Further, any of the multiple layers may record the characteristic information of each layer. For example, both the first recording layer and the second recording layer However, it is possible to store the first characteristic information and the second characteristic information.

 That is, in the recording medium 100 having a plurality of layers, information indicating the reflection characteristics corresponding to each of the plurality of layers may be recorded in any one of the layers! /.

 Furthermore, the area where the characteristic information is recorded is not limited to the PIC area 104. As long as the characteristic information can be recorded and the predetermined device can read the characteristic information, the position of the recording medium to be recorded is not limited. For example, the characteristic information can be recorded in the lead-out area 103. Alternatively, the characteristic information may be recorded in the data area 102.

 The characteristic information is recorded by the recording medium manufacturer when the recording medium 100 is manufactured. In the case where the recording medium 100 is a read-only recording medium, the data is already shipped in a recorded state. The recording medium manufacturer ships the recording medium after recording the characteristic information in the PIC area. Further, even when the recording medium 100 is a writable recording medium or a write-once recording medium (for example, DVD-RAM, DVD-RW), the recording medium manufacturer records information about the recording medium at the time of recording medium manufacture. Recording in (for example, the PIC area) Recording of characteristic information on the recording medium 100 is not limited to when the recording medium 100 is manufactured. For example, characteristic information may be recorded by a user when user information is recorded on the recording medium 100 or when user information is played back. The predetermined device reads the characteristic information when accessing the recording medium 100 (for example, when recording user information on the recording medium 100 or reproducing user information).

 2.Access device

 FIG. 2 shows a configuration of an access device (optical disk device) 200 according to the embodiment of the present invention. The access device 200 is configured such that the recording medium 100 can be inserted. The recording medium 100 includes a characteristic information area in which characteristic information is recorded, and the characteristic information is recorded in the characteristic information area.

The access device 200 mainly includes an optical head unit 202 that reads predetermined information recorded on the recording medium 100, and an information processing device 225 that processes the read predetermined information. The information processing device 225 includes a characteristic determination unit 204 that determines the reflection characteristic of the recording medium 100, and a processing unit 226 that processes predetermined information according to the determined reflection characteristic. processing Means 226 includes signal polarity inversion means 206, signal processing means 208, modulation degree calculation means 216, threshold value changing means 217, defect portion detection means 218, optical disk controller 219, reflection level adjustment means 220, Is provided.

 The optical head unit 202 functions as a reading unit that accesses the recording medium 100 and reads a signal indicating information recorded from the recording area of the recording medium 100. The information includes characteristic information and user information. User information includes, for example, audio information, video information, and other data.

 The characteristic discriminating means 204 detects the characteristic information from the signal curve read by the optical head unit 202 and, based on the detected characteristic information, the characteristic of the recording medium 100 (the force LtoH that the recording medium 100 is an HtoL type optical disk). Discriminating force that is a type optical disc.

 Based on the characteristic information read by the optical head unit 202, the signal polarity inversion means 206 inverts the polarity of the signal indicating the user information.

 For example, when the recording medium 100 is an HtoL type, the polarity of the signal corresponding to the recording mark is inverted from negative to positive, and the polarity of the signal corresponding to the space is inverted from positive to negative. On the other hand, when the recording medium 100 is an LtoH type optical disc, the polarity of the signal corresponding to the recording mark is kept positive, and the polarity of the signal corresponding to the space is kept negative.

 The signal processing means 208 includes an edge shift detection means 210, an asymmetry detection means 212, and a β value detection means 214. The input signal is processed by these means included in the signal processing means 208. For example, the edge shift detection unit 210 detects the edge shift amount based on the input signal. The asymmetry detecting means 212 detects the asymmetry of the signal based on the input signal. The j8 value detection means 214 detects the β value of the signal based on the input signal.

The signal polarity reversing means 206 is configured so that the polarity of the signal corresponding to the recording mark in the signal indicating the user information becomes positive, and the polarity of the signal corresponding to the space in the signal indicating the user information is negative. Control the polarity of the signal. The signal whose polarity is controlled is input to the signal processing means 208. Therefore, the signal processing means 208 has the positive polarity of the signal corresponding to the recording mark and the space regardless of whether the recording medium 100 mounted on the access device 200 is a force LtoH type optical disc that is an HtoL type optical disc. Signal poles corresponding to The input signal can be processed on the assumption that the sex is negative. As a result, the development burden on the system controller is reduced and debugging efficiency can be improved.

 Modulation degree calculation means 216 calculates the modulation degree of the signal indicating the user information according to the characteristic information. Details of the function of the modulation factor calculation means 216 will be described later.

 The defect portion detection means 218 detects at least one defect portion based on the reflection level of the reflected light detected by the optical head unit 202 and a predetermined threshold value. For example, foreign matter (dust, fingerprints, etc.) may adhere to the recording area of the recording medium 100. When light is irradiated on the area where the foreign matter is attached, the reflected light is scattered due to the attachment of the foreign matter. Therefore, it is almost impossible to detect the reflection level of the reflected light from the area where the foreign matter is attached. The defective part detecting means 218 detects an area where the reflected light is hardly detected as a defective part.

 The threshold value changing means 217 changes the predetermined threshold value in order to adjust the difference between the detected reflection level and the predetermined threshold value according to the characteristic information. For example, the threshold value changing means 217 responds to the characteristic information so that an abnormality in the detected reflection level can be detected by adjusting a difference between the detected reflection level and a predetermined threshold value. To change the predetermined threshold.

 Details of the functions of the threshold value changing means 217 and the defective portion detecting means 218 will be described later.

 The optical disk controller 219 is configured to transmit light for recording information on the recording medium 100 based on a signal output from at least one of the signal processing unit 208, the modulation degree calculation unit 216, and the defect portion detection unit 218. Adjust the irradiation level. For example, the light irradiation level to be adjusted indicates at least one of write power, erase power, and bottom power.

The reflection level adjustment unit 220 adjusts the reflection level of light for reproducing information from the recording medium 100 based on the characteristic information and the signal generated by the optical disk controller 219. The reflection level adjusting unit 220 adjusts the light reflection level by adjusting the light irradiation level that the optical head unit 202 irradiates the recording medium 100 with. For example, when the characteristic information indicates that the recording medium 100 is an LtoH type, the reflection level adjusting means 2 No. 20 reduces the light reflection level by weakening the intensity of the light irradiated by the optical head unit 202. Therefore, the intensity of light reflected by the LtoH type optical disk can be reduced. As a result, the LSI dynamic range can be used efficiently.

 Hereinafter, the details of the function of the modulation factor calculation means 216 will be described.

 The modulation degree calculation means 216 calculates the modulation degree of the predetermined information based on the light reflection level detected by the optical head unit 202 and the characteristic information. Specifically, the degree-of-modulation calculating unit 216 also reflects the reflection level force of the light detected by the optical head unit 202 and the reflection level of the light reflected by the unrecorded area (space) and the recording part (recording mark). The reflection level of the reflected light is detected, and the modulation degree of the predetermined information is calculated based on the two detected levels. Here, the reflection level of the light detected by the optical head unit 202 indicates predetermined information. Figures 3A and 3B show the relationship between the illumination level of the light applied to the optical disc and the reflection level of the light reflected from the optical disc. Fig. 3A shows the relationship between the irradiation level of light irradiated on an HtoL type optical disc and the reflection level of light reflected on the HtoL type optical disc. The horizontal axis shows the irradiation level of the light irradiated on the Hto L-type optical disc. The vertical axis shows the reflection level of the light reflected by the HtoL type optical disc.

 When the characteristic indicated by the characteristic information is an HtoL characteristic, the modulation degree Mod is defined by (Equation 1).

 (Formula 1)

Mod = (A-B) / A

Here, “A” indicates the reflection level of the light reflected by the unrecorded area (space), and “B” indicates the reflection level of the light reflected by the recording unit (recording mark).

 Fig. 3B shows the relationship between the illumination level of the light irradiated on the LtoH optical disc and the reflection level of the light reflected on the LtoH optical disc. The horizontal axis shows the illumination level of the light irradiated on the LtoH type optical disc. The vertical axis shows the reflection level of the light reflected by the LtoH type optical disc. In the case of the characteristic force SLtoH characteristic indicated by the characteristic information, the modulation degree Mod is defined by (Equation 2).

 (Formula 2)

Mod = (BA) ZB Modulation degree computing means 216 includes a first computing unit for computing (Equation 1) and a second computing unit for computing (Equation 2). The modulation degree calculating means 216 can calculate the modulation degree of the predetermined information by switching these two calculators according to the characteristic information.

 Conventionally, even if an optical disc has different reflection characteristics, the modulation factor is calculated using the same formula! /. Therefore, for example, when the modulation factor is measured with the above (formula 1) for an LtoH type optical disc, There was a problem that the sensitivity deteriorated. However, according to the reflection characteristics of the optical disc as in this embodiment, the modulation factor is changed by switching between the first computing unit for computing (Equation 1) and the second computing unit for computing (Equation 2). By obtaining this, the sensitivity of modulation can be made equal.

 By improving the accuracy of modulation degree measurement in the present embodiment, for example, the optimum recording power can be determined more accurately. The method for determining the optimum recording power will be described as follows with reference to FIGS. 4A and 4B.

 FIG. 4A is a diagram showing a repetitive recording portion and a non-recording portion of a single pattern of 8T space (8Ts) and 8T mark (8Tm) with respect to an HtoL type disc in which the reproduction amplitude of the recording portion decreases. The vertical axis represents the reproduction amplitude level when the recorded part and the unrecorded part are reproduced, and the horizontal axis represents the track direction (time axis direction). As shown in FIG. 4A, Atop shows the maximum value of the reflection level of the reproduction signal, and Abtm shows the minimum value of the reflection level of the reproduction signal. Atop and Abtm are amplitude levels from a certain reference level. Here, the reference level may be, for example, a level detected when the laser power for reproduction is turned off (when the laser is turned off). Further, the reference level may be a predetermined level in the circuit that detects the reproduction amplitude. In this embodiment, an 8T repetitive signal is used to obtain the modulation factor, but the present invention is not limited to this.

As shown in Fig. 4B, in order to determine the optimum recording power Pwo, the modulation power Mod is measured by changing the recording power Pw (up to high power and low power). In FIG. 4B, the vertical axis shows the modulation degree Mod when the recorded track is reproduced and the horizontal axis shows the change in the recording power Pw. When the recording power Pw is low, the amplitude of the playback signal is small, so the modulation factor Mod is small. As the recording power Pw increases, the amplitude of the reproduction signal increases, so the modulation degree Mod increases. Recording disc for each disc There are parameters for determining ヮ. These parameters are stored in advance for each disc by the force described on the disc or by the recording / reproducing apparatus. As an example, a certain recording power obtained modulation degree when (Ptg) (Mtg), (recording power when the amount of reflection begins changing and irradiating a laser disk) which records Ru is started and p _t h, P th And Ptg proportionality parameter kk and Ptg and Pwo proportionality parameter rr. They have the relationship Ptg = Pth X kk and Pwo = Ptg Xrr. Pth is the tangential force of the modulation curve when recording at a recording power near Ptg. The optimum recording power determination procedure is as follows. First, measure the modulation degree at several powers near Ptg, and obtain the modulation degree curve as shown in Fig. 4B. Using the degree of modulation near Mtg, find the tangent line, and find Pth, the intersection with the X axis.

Multiply Pth by kk and rr to calculate the optimum recording power Pwo.

 As described above, the modulation degree is used in calculating the optimum recording power Pwo. For this reason, in order to calculate the optimum recording power Pwo, it is necessary to obtain an appropriate modulation degree. In the present embodiment, the modulation factor is obtained by switching between the first computing unit for computing (Equation 1) and the second computing unit for computing (Equation 2) according to the reflection characteristics of the optical disc. For this reason, it is possible to calculate an appropriate degree of modulation and, in turn, it is possible to calculate the optimum recording power Pwo.

Hereinafter, the details of the functions of the threshold value changing means 217 and the defect portion detection means 218 will be described. FIG. 5 shows the detected light reflection level! /, The value, the ground level, and the detection signal. Is detected based on a light reflection level and a threshold value. The difference between the reflection level B of the light reflected by the space (unrecorded part) of the LtoH type optical disk and the ground level is the difference between the reflection level A and the ground level of the light reflected by the space (unrecorded part) of the HtoL type optical disk. It is smaller than the difference. Therefore, in the case of an LtoH type optical disc, it is necessary to accurately set the threshold value B for detecting the defective portion between the reflection level B and the ground level. For example, if threshold A is set for an LtoH type optical disc, the threshold A level is close to the reflection level B, so that an unrecorded part (space) is erroneously detected as a defective part. Can be done. When the characteristic discriminating unit 204 determines that the optical disc characteristic force LtoH characteristic is based on the characteristic information !, the threshold value changing unit 217 may detect an abnormality in the detected reflection level. Change the threshold. For example, the threshold value B is changed so as to reduce the threshold value B in order to increase the difference between the light reflection level B and the ground level B. The threshold value changing means 217 outputs a signal indicating the reduced threshold value (threshold value B) to the defective portion detecting means 218.

 The defective portion detection means 218 compares the threshold value B indicated by the signal with the reflection level, and generates a detection signal B indicating the defective portion.

 Thus, the defect portion can be accurately detected based on the light reflection level B and the threshold B by changing the value so that the abnormality of the detected reflection level can be detected. The access device 200 holds the control operation during the defective portion detection period. By accurately detecting the defective portion, the access device 200 can accurately recognize the period in which the control operation needs to be held. In this case, the access device 200 may record the area of the detected defective part, and may not perform the control operation for the recorded area at the time of control.

 The access device 200 according to the embodiment of the present invention has been described with reference to FIGS. 2 to 5. For example, in the example described with reference to FIG. 2, the optical head unit 202 is “recorded on the recording medium”. Functions as a “reading means for reading predetermined information”, a characteristic determining means 204, a signal polarity inverting means 206, a signal processing means 208, a modulation degree calculating means 216, a threshold value changing means 217, and a defect portion detecting means. 218, the optical disk controller 219, and the reflection level adjusting means 220 function as “the information processing apparatus according to claim 1, which processes the read predetermined information”. However, the access device 200 of the present invention is not limited to that shown in FIG. As long as the functions of the respective means described above are achieved, an apparatus having any configuration can be included in the scope of the present invention.

For example, when the recording medium 100 is an HtoL type, the signal polarity inversion means 206 can maintain the polarity of the signal corresponding to the recording mark negative and maintain the polarity of the signal corresponding to the space positive. In addition, the signal polarity reversing means 206 has a recording medium 100 of LtoH type. In the case of an optical disk, the polarity of the signal corresponding to the recording mark can be reversed from positive to negative, and the polarity of the signal corresponding to the space can be reversed from negative to positive. Therefore, the signal processing means 208 has a negative polarity in the signal corresponding to the recording mark regardless of whether the recording medium 100 loaded in the access device 200 is an HtoL type optical disk or an LtoH type optical disk. Assuming that the corresponding signal is positive in polarity, the input signal can be processed. As a result, the development burden on the system controller is reduced, and debugging efficiency can be improved.

 Further, the reflection level adjusting means 220 is not limited to reducing the reflection level of light detected by the optical head unit 202 by reducing the intensity of light emitted by the optical head unit 202. For example, when the characteristic information indicates that the recording medium 100 is an LtoH type, the reflection level adjustment means 220 detects the optical head unit 202 by weakening the reflected light detection capability of the optical head unit 202. The light reflection level can be reduced. Therefore, the intensity of the light reflected by the LtoH type optical disk can be reduced. As a result, the LSI dynamic range can be used efficiently.

 Note that the characteristic discriminating unit 204 can discriminate the characteristic of the optical disc even when the characteristic information is not recorded on the optical disc. For example, the optical head unit 202 irradiates light onto an unrecorded area of an optical disc on which no characteristic information is recorded. The optical head unit 202 detects the reflection level of the light reflected by the unrecorded area, and sends a signal indicating the reflection level of the light reflected by the unrecorded area to the characteristic determining unit 204. The characteristic discriminating means 204 discriminates whether the optical disc is HtoL type or LtoH type based on whether the reflection level of the light indicated by this signal is larger than a predetermined value! Can do.

Such characteristic determination may be performed on the recording medium 100 on which characteristic information is recorded. At this time, if the reflection characteristic determined by the characteristic determination unit 204 also determines the reflection level force of the light and the reflection characteristic determined by the characteristic determination unit 204 from the characteristic information column, the characteristic determination unit 204 again checks the optical disc. The characteristic discriminating means 204 prioritizes the characteristic information and performs the subsequent processing. Alternatively, the characteristic discriminating means 204 operates the optical disk controller 219 to write to the optical disc. It is possible to take measures such as prohibiting. 3. How to access

 FIG. 6 shows an access processing procedure according to the embodiment of the present invention.

 The access processing procedure according to the embodiment of the present invention will be described step by step with reference to FIGS. The access processing procedure is executed by the access device 200. The recording medium 100 is inserted into the access device 200!

 Step 302: The access device 200 is activated.

 Step 304: As the access device 200 is activated, the optical head unit 202 accesses the PIC area 104 of the recording medium 100, and the optical head unit 202 reads the characteristic information from the PIC area 104.

 Step 306: The characteristic discriminating means 204 discriminates whether the recording medium 100 is a force LtoH type optical disc that is an HtoL type optical disc based on the read characteristic information.

 Step 308: When it is determined that the recording medium 100 is an HtoL type optical disk, the characteristic determination unit 204 includes a signal polarity inversion unit 206, a threshold value changing unit 217, a modulation degree calculation unit 216, and a reflection level adjustment unit. For 220, the HtoL type optical disc power is also set to process the read information.

 When it is determined that the recording medium 100 is an LtoH type optical disc, the characteristic determining unit 204 includes a signal polarity inverting unit 206, a threshold value changing unit 217, a modulation degree calculating unit 216, and a reflection level adjusting unit 220. On the other hand, LtoH type optical disc power is set to process the read information.

 Optical disc power After the settings for processing the read information are complete, the process proceeds to step 310.

 Step 310: The optical head unit 202 accesses the data area 102 of the recording medium 100, and the optical head unit 202 reads user information from the data area 102.

 Step 312: The access device 200 processes the read user information.

 The access processing procedure according to the embodiment of the present invention has been described above with reference to FIG. 1, FIG. 2, and FIG.

Note that the access processing procedure of the present invention is not limited to the procedure shown in FIG. As long as each procedure described above is executed, a method having an arbitrary procedure is within the scope of the present invention. Can be included.

 The embodiment of the present invention has been described above with reference to FIGS.

 For example, each unit described in the embodiment shown in FIG. 2 may be realized by hardware, may be realized by software, or may be realized by hardware and software. Whether it is realized by hardware, software, or hardware and software, it can have any procedure as long as the access processing procedure of the present invention can be executed.

 For example, the access device of the present invention stores an access processing program for executing access processing.

 The access processing program may be stored in advance in storage means included in the access device when the computer is shipped. Alternatively, the access processing program may be stored in the storage means after the computer is shipped. For example, a user may download an access processing program from a specific website on the Internet for a fee or free of charge, and install the downloaded program on a computer. When the access processing program is recorded on a computer-readable recording medium such as a flexible disk, CD-ROM, or DVD-ROM, the access processing program is stored in the computer using an input device (for example, a disk drive device). It may be installed. The installed access processing program is stored in the storage means.

 Further, the information processing device 225 (see FIG. 2: for example, the characteristic discriminating means 204, the signal polarity inverting means 206, the signal processing means 208, the modulation degree calculating means 216, the threshold value changing means 217, the defect The partial detection means 218, the optical disk controller 219, and the reflection level adjustment means 220 can be manufactured as a one-chip LSI (semiconductor integrated circuit) or a part thereof. When the information processing device 225 is manufactured as a one-chip LSI, the manufacturing process of the access device can be facilitated. Each part of the information processing device 225 may be independently manufactured as an LSI, or a part of the information processing device 225 may be independently manufactured as an LSI.

Further, the access device 200 retrieves the characteristic information from the recording medium 100 on which the characteristic information is recorded. Although the example of reading was demonstrated, the acquisition path | route of characteristic information is not restricted to this. For example, although the access device 200 is not shown, a plurality of characteristic information is stored in advance in a storage unit or the like, and the characteristic information corresponding to the optical disk mounted in the access device 200 is read out and used. May be. Further, the access device 200 may acquire the characteristic information from the outside, for example, a specific website on the Internet.

 As described above, the power of the present invention exemplified by the preferred embodiment of the present invention should not be construed as being limited to this embodiment. It is understood that the scope of the present invention should be construed only by the claims. It is understood that those skilled in the art can implement an equivalent range based on the description of the present invention and the common general technical knowledge from the description of specific preferred embodiments of the present invention. Patents, patent applications, and literature references cited in this specification should be incorporated by reference as if the contents themselves were specifically described in the present specification. Is understood.

Claims

The scope of the claims  [1] An information processing apparatus for processing predetermined information recorded on a recording medium,  Characteristic discriminating means for discriminating the reflection characteristic of the recording medium;  Processing means for processing the predetermined information according to the determined reflection characteristic, and  The reflection characteristic is the reflectance of light reflected by the recorded area of the recording medium (hereinafter referred to as the first characteristic). The first characteristic is greater than the reflectance of light reflected in the unrecorded area of the recording medium (hereinafter referred to as the second reflectance), and the first reflectance is greater than the second reflectance. Is one of the smaller second features,  Information processing device.  [2] The characteristic determining unit determines the reflection characteristic based on characteristic information recorded on the recording medium and indicating at least one of the first characteristic and the second characteristic.  The information processing apparatus according to claim 1. [3] The recording medium has a plurality of recording layers, and records the characteristic information corresponding to the reflection characteristics of each of the plurality of recording layers.  The information processing apparatus according to claim 2. [4] The characteristic determining means determines the reflection characteristic based on a reflection level of light reflected by the recording medium.  The information processing apparatus according to claim 1. [5] The processing means includes polarity reversing means for reversing the polarity of the predetermined information in accordance with the determined reflection characteristic.  The information processing apparatus according to claim 1. [6] The processing means includes a modulation degree calculation means for calculating a modulation degree of the predetermined information according to the determined reflection characteristic.  The information processing apparatus according to claim 1. [7] The processing means is based on the determined reflection characteristic and the reflection level of light reflected by the recording medium, and is a threshold value for the reflection level and a defect in the recording medium. 2. The information processing apparatus according to claim 1, further comprising threshold changing means for changing a threshold for detecting the portion. [8] Reflection level detection means for detecting the reflection level;  A defect portion detecting means for detecting a defective portion of the recording medium based on the threshold value changed by the threshold value changing means and the reflection level detected by the reflection level detecting means;  Further comprising  The information processing apparatus according to claim 7. [9] The processing means includes a reflection level adjusting means for adjusting a reflection level of the irradiated light according to the determined reflection characteristic.  The information processing apparatus according to claim 1. [10] reading means for reading predetermined information recorded on the recording medium;  An access device comprising: the information processing device according to claim 1 that processes the read predetermined information. [11] A recording medium having a recording area,  The recording area is an area for recording characteristic information indicating characteristics of the recording medium,  The characteristic information includes a reflectance of light reflected from a recorded area of the recording medium (hereinafter referred to as a first reflectance) and a reflectance of light reflected from an unrecorded area of the recording medium (hereinafter referred to as a second reflectance). Information indicating at least one of a first characteristic that is greater than a second characteristic and a second characteristic in which the first reflectance is smaller than the second reflectance.  recoding media. [12] comprises a plurality of recording layers,  The recording area records the characteristic information corresponding to each of the plurality of recording layers.  The recording medium according to claim 11. [13] An information processing method for processing predetermined information recorded on a recording medium, A characteristic determining step for determining a reflection characteristic of the recording medium; A processing step for processing the predetermined information according to the determined reflection characteristic, and  The reflection characteristic is the reflectance of light reflected by the recorded area of the recording medium (hereinafter referred to as the first characteristic). The first characteristic is greater than the reflectance of light reflected in the unrecorded area of the recording medium (hereinafter referred to as the second reflectance), and the first reflectance is greater than the second reflectance. Is one of the smaller second features, Information processing method.  An information processing program for causing an information processing apparatus that processes predetermined information recorded on a recording medium to perform information processing,  A characteristic determining step for determining a reflection characteristic of the recording medium;  A processing step for processing the predetermined information according to the determined reflection characteristic, and  The reflection characteristic refers to the reflectance of light reflected from the recorded area of the recording medium (hereinafter referred to as the first reflectance) to the reflectance of light reflected from the unrecorded area of the recording medium (hereinafter referred to as the second antireflection characteristic). A first characteristic that is greater than the second reflectance, and the first reflectance is smaller than the second reflectance. Information processing program.